Am really liking those hooks called Command Strips. They come in various shapes and sizes....and tell you howmany pounds they'll hold. You can remove them without damage to the wall.

I am using several (the ones that say they can hold 7 lbs.) in the shower to hang up items to dry...towels, washcloths, and even a plastic bag of dirty clothes.

Have also used two to hold up a net bag with pockets ... just below the shower head... for holding several things, likesoap and spray bottles, scrubber, etc. They also hold a bag of doggie "bags" and leash by the door.